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RIGGING CML 2026-27 WITH A[?]is a dolly consisting of two forks that are hydraulically lifted above a set of wheels. - ANSWER pallet jack Why would you complete a test lift? - ANSWER To confirm load balance and stability There must be enough space for the maximum [?] of the crane and its surrounding safe zone while in operation. - ANSWER footprint Which one of these conditions would make it a lift complex? - ANSWER Hoisting in a nuclear facility When lifting a load that may swing uncontrollably, what is a good method to control the load? - ANSWER tag line In a prelift check, what should be done prior to the actual lift to help find any additional issues? - ANSWER dry run Many cranes require a firm, graded, and [?] area for initial assembly and operation. - ANSWER well drained The size of a fall zone depends on what? - ANSWER size of the load Complex lifts may require multiple signalpersons stationed at different locations, such as [?] . - ANSWER enclosed spaces When giving the [?] signal, the signalperson must watch the crane for two- blocking. - ANSWER Extend Telescoping Boom Which types of signals may be useful in extremely noisy environments or areas with significant radio interference? - ANSWER audible signals There are how many standard signals a qualified signalperson must be familiar with? - ANSWER 21 What Subpart is Signals for Cranes & Derricks in construction found under? - ANSWER Subpart CC Calculate the following asymmetrical rigging scenario. The load to be lifted has lift points 120 inches apart. The center of gravity is located 80 inches from point A. If the load is 9,000 pounds, what is the weight experienced by point B? - ANSWER 9,000 x 80/120 = 9,000 x 0.6667 = 6,000 Ib What is the total material weight of a load consisting of 35 pieces of 4-foot by 8- foot steel sheets that are 1/16 inches thick? Note: A steel sheet at 1/16 inches thick weighs 2.55 pounds per square foot (psf). - ANSWER 4 ft « 8 ft = 32 ft2 --> 32 ft2 x 2.55 psf x 35 pieces = 2,856 Ibs Lifting Force can be measured directly with either a dynamometer or a [?] . - ANSWER load cell Calculate the following asymmetrical rigging scenario. The load to be lifted has lift points 120 inches apart. The center of gravity is located 40 inches from point B. If the load is 9,000 pounds, what is the weight experienced by point A? - ANSWER 9,000 x 40/120 = 9,000 x 0.3333 = 3,000 Ib If 1/2-inch steel EMT conduit weighs 0.30 pounds per foot, what is the total weight of a bundle of 75 pieces of 20-foot long, 1/2-inch size EMT conduit weigh? - ANSWER A large rectangular load is slightly lifted at one end (lift point A), anda dynamometer indicates a force of 6,000 pounds. Then the opposite end (lift point B) is lifted, and the dynamometer indicates a force of 4,000 pounds. The distance between the lift points is 120 inches. Where is the CG along its length? - ANSWER 43° What is the total material weight of a load consisting of 20 pieces of 4-foot by 10- foot steel sheets that are 1/4-inch thick? Note: A 1/4-inch thick steel sheet weighs 10.2 pounds per square foot (psf). - ANSWER 40 ft2 « 10.2 psf x 20 pieces = 8,160 Ibs Lifting Force can be measured directly with either a dynamometer or a [?] - ANSWER load cell If a load is symmetrical along one dimension then the center of gravity is likely to be in the [?] of that dimension. - ANSWER middle For a horizontal movement of a load on a downward incline, you may need to use a manual hoist or [?] and [?] . - ANSWER block / tackle No written plan or special precautions are usually required for [?]. - ANSWER common lifts The services of a(n) [?] is necessary if the lift requires equipment or procedures that are unusual and do not conform to established standards. - ANSWER qualified engineer Binding is an indication that the links have [?] because the sides bow inward and prevent adjacent links from moving freely. - ANSWER stretched Identification characters directly on chain links are [?] and include the manufacturer's mark, traceability, or date code. - ANSWER raised To prevent slippage of a chain sling, a [?] may have to be utilized. - ANSWER lifting beam A two-leg sling has the best load capabilities at how many degrees? - ANSWER 60 degrees Which chain is showing signs of bent links? - ANSWER ( D. ) Which chain is showing signs of elongation? - ANSWER (C. ) Which chain is showing signs of gouging? - ANSWER ( B. ) Which chain is showing signs of excessive wear? - ANSWER (A. ) With multiple leg slings, sling load calculations should be performed to ensure that individual legs of a sling are not overloaded, especially when connected to [?] loads. - ANSWER asymmetrical [?] treatment can be used to develop the desired combination of strength and durability in a metal. - ANSWER Heat Identification directly on Grade 80 and Grade 100 chain links include [?]. - ANSWER all of the above (manufacturer's mark, raised characters, traceability or date code) According to ASME B30.9, chains should be removed from service if the thickness of any part of a link has decreased by [?] . - ANSWER 10% When chain is going to be used in below -40°F conditions, you must [7]. - ANSWER consult the manufacturer If a chain is needed in a chemically active environment, it may need to be made of a special [?] alloy. - ANSWER non-corroding Identifying numbers are embossed on links at intervals no greater than [?] apart. - ANSWER 3° The use of [?] alloy chains are available and can be used under conditions where regular steel alloy chains would be adversely affected by chemicals. - ANSWER stainless-steel Chain sling legs may be shortened with [?] for this use by the chain manufacturer or a qualified person. - ANSWER approved hardware OSHA requires that the proof test verification be retained by the [?] . - ANSWER employer Lifting chain is designed to elongate before fracturing as much as [?] . - ANSWER 15% - 30% Chain costs [?] compared to wire rope of similar strength. - ANSWER less Chain for rigging is normally favored over wire rope because chain has approximately [?] times the impact absorption capability and is more flexible. - ANSWER 3 The chain sling specifications are identified by the manufacturer on a(n) [?]. - ANSWER attached nameplate or tag Chain slings are made by [?] from lengths of chain and rigging hardware components. - ANSWER manufacturers Synthetic slings generally include [?] warning yarns within the body that are not normally visible. - ANSWER red Web sling strength is based on [?] webbing material. - ANSWER new The [?] is the ratio of the strength of a bent rope to its nominal strength rating. - ANSWER bending efficiency The [?] is the ratio of the diameter of a bend to the nominal diameter of the rope. - ANSWER bend ratio Identify and match the wire rope damage. - ANSWER from top to bottom: wear, corrosion, kinking, crushing, broken, bird caging Typically, in lifting and rigging operations, [?] wire rope is used. - ANSWER bright Most rigging applications use a safety factor of [?] .- ANSWER 5 A [?] socket is a socket that uses molten zinc or resin to secure the end of a wire rope inside the socket. - ANSWER spelter A[?]is a category of knots that are used to tie the ends of two ropes together. - ANSWER bend A(n) [?] splice is commonly done to tag lines on a working end in order to mark the end of the rope. - ANSWER back In configurations of four parts or more, the speed of each sheave is different. Which sheave moves fastest? - ANSWER Nearest to lead line What is the simplest reeving method? - ANSWER Lacing A block-and-tackle assembly has four parts and is used to lift a load of 1,000 pounds. The lead-line force is 250 pounds. The lead line is pulled at a 40° angle from vertical. What is the block loading estimate? - ANSWER Block loading = 250 Ib x 1.87 + (1,000-250) Block loading = 468 + 750 Block loading = 1,218 Ib A block-and-tackle assembly has three parts and is used to lift a load of 1,200 pounds. The lead-line force is 400 pounds. The lead line is pulled at a 60° angle from vertical. What is the block loading estimate? - ANSWER Block loading = 400 Ib * 1.73 + (1,200-400) Block loading = 692 + 800 Block loading = 1,492 Ib What is the minimum force required to lift a 10,000-Ib load using a four-part reeving system equipped with plain bearing sheaves? Note: The bend ratio is 15. Therefore, the friction of each sheave adds an additional 7% of the load weight to the total, and the associated friction factor is 0.33. - ANSWER Force = Weight x Friction Factor = 10,000 Ib x 0.33 = 3,300 Ib What is the mechanical advantage of a three-part reeving system? - ANSWER 3:1 If the lead line of single sheave is held vertically, how much force would the block experience when lifting a 100-pound load? - ANSWER 200 Ibs When the sheave groove is too narrow, the rope causes wear of the sheave groove known as [?] . - ANSWER corrugation A hand-chain hoist is a manually operated hoist that uses the rotation of a continuous loop [?] to provide an input torque to a gear drive. - ANSWER hand chain A brake test checks for proper operation of a hoist ? system when under load. - ANSWER braking On some cranes, the upper limit switch mechanism is known as a(n) [?] . - ANSWER anti-two-blocking device Lower limit switches prevent a hoist from reaching the end of its [?] .- ANSWER hoisting line [?] limit switches prevent a hoist hook from impacting a hoist or boom, which would cause damage to the wire rope or chain and potentially overload the motor. - ANSWER Upper Slip clutches are designed to slip at [?] to 125% of the hoist's rated capacity. - ANSWER 110% Hand-chain hoists must be hung [?] so that the hand chain is free to rotate around the wheel. - ANSWER vertically A hoist's input shaft turns at a(n) [?] rate than the output shaft. - ANSWER faster In a hoist, distance relates to how many more times the input shaft must rotate for the output shaft to rotate [7]. - ANSWER once 
